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The reason you don't see particles stems from the fact that the particlecloud topic does not appear to be publishing... Some things to try:

roslaunch turtlebot_navigation amcl_demo.launch map_file:=/tmp/my_map.yaml

If you followed the tutorials, you've already done that. Other things:

rostopic list

Edit your question and put the output of the above at the bottom. Also, check for errors in configuration. I'll be more useful after more output...